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I need to print a representation of an ArrayList of strings to the given output stream (out):

public void outputBag(OutputStream out)
        throws IOException
{


}

I'd usually do this in the main function by using writer and be done with it. But I have to use the above method this time. Thing is, I have no idea how OutputStream is supposed to work, I spent a couple of hours reading javadocs and watching videos but to no avail.

Can you guys show me an example of how I'd do this?

Thank you.

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1 Answer

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Java's streams, readers, and writers are modular and designed to work together. Usually you wrap bare OutputStreams in something with a richer interface, like a PrintStream, to make it easier to use. So, for example:

PrintStream ps = new PrintStream(out);
ps.print("The array list has this many elements: ");
ps.println(theArrayList.size());
ps.println(theArrayList.toString());
ps.flush();

I don't know what your "string representation of an ArrayList" should be, so I just made something up; you may want to do something different, but it would be similar in spirit.

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